1. Institute for Health Research; Kaiser Permanente Colorado; Denver CO USA
2. Department of Pediatrics; University of Colorado School of Medicine; Aurora CO USA
3. Community Health Services; Denver Health; Denver CO USA
4. Marshfield Clinic Research Foundation; Marshfield WI USA
5. HealthPartners Institute; Minneapolis MN USA
6. Division of Research; Kaiser Permanente Northern California; Oakland CA USA
7. Department of Research and Evaluation; Kaiser Permanente Southern California; Pasadena CA USA
8. Center for Health Research; Kaiser Permanente Northwest; Portland OR USA
9. Kaiser Permanente Washington Health Research Institute; Seattle WA USA
10. Department of Population Medicine; Harvard Medical School; Boston MA USA
11. Immunization Safety Office; Centers for Disease Control and Prevention; Atlanta GA USA